Hydrodynamic properties of poly-1, 2,5-trimethyl- and 2,5-dimethyl-4-ethynilpyperidol-4 hydrochlorides in solution

Poly-1,2,5-trimethyl- and 2,5-dimethyl-4-vinylethynyl-pyperidol-4 hydrochlorides with strong polyelectrolyte properties have been investigated in water-salt and water-alcohol mixtures. The parameters K_η and a, K_s and b in the Mark-Houwink equation, the unpertubed dimensions K_o and flexibility factor of polymer chain σ were determined in these solvents. We also studied the influence of ionic strength, the values of counterion charges and temperature on the size of polyelectrolyte molecules. The formation of interchain ‘bridges’ in the case of multivalent anions were found, resulting in a strong decrease of the chain dimensions. The addition of organic solvent gives a 2–3-fold in intrinsic viscosity, whereas the conformational parameters change little.